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User-Agent Parser & Spoofer

Decode any User-Agent string into human-readable browser, engine, OS, device and CPU data. Use the Spoofer Helper to copy common UAs for cURL, Wget, or penetration testing.

What is the User-Agent Parser & Spoofer Helper?

Every browser and HTTP client sends a User-Agent string identifying itself; paste one in here and this tool breaks it down into browser, rendering engine, OS, device type, and CPU architecture, and also keeps a library of common UA strings you can copy for testing.

How it works

Parsing runs a fixed, ordered list of regular expressions against the string for each category — browser, engine, OS, device, CPU — and takes the first pattern that matches, the same approach real UA-sniffing libraries use. The Spoofer Helper is just a static list of known UA strings (Googlebot, recent Chrome/Firefox/Safari builds, curl, iPhone) that re-run through the same parser when you load one.

SysAdmin & security use cases

  • Confirm what UA a curl command, script, or scraper is actually sending before debugging a block.
  • See how a site's markup or layout changes when it's requested with a mobile UA versus desktop.
  • Load a Googlebot UA to check how a page responds to crawler-specific server logic.
  • Cross-check a raw UA string logged by your analytics against what it should decode to.